Hydraulic valve-gear.



which the following 1s a specication.

RICHARD H; RICE, or LYNN, Messv "COMPANY,- A connexe HYnnieu-'Lm vnzuni e specmeeon of mettere-retenu Patented me 1155s. ggfg lituanien mec .December '29:,1e1c. serial No. 879,573.'

Todzwls it may conccm."v it that.I, R rcHAnD H. Riomacitizen of the'Unit'ed States residing at Lynn; county of Eese, Stat e .of -llafssaclmsetts,"f1ave invented certain new and useful improvements in. Ilydraulic',Valve(tears, of 'lfhcgpresentinventin relates to hydraulic gear fof* the type having. a piston und @y site sides ofthe piston being controlled by -a 'pi-lot valve? which in .tu-rn is moved by a governorother controlling means'.

The' Aprimary -objectof .the invention nto provlde'an'improved arrangement which is simple-in structure? composed of few parts endzcen be manufactured ata relatively low cost,and which, due'tonits simplicity and thc: ew parts requiredijgivesa lmore per# feet .control of 'the governor over the regulating' mechanism, and la' longer .eEective life.

For. al consideratlon of what 'I believe to `be novel and'myinvention, attention is directed Vliuid tightsliding fit with`the bore ofthev tothe .accompanyingspecification and the claims appended thereto The accompanying drawing'is' a sectional viewv of onelform which my v invention may' 1 take the drawing. 1 indicates a valve-1 structurel"-for 'controlling'.a supply 'of fluid for any purpose, For example, controlling the badmission ofv steam to an 'alasticuid turbine.v The larraingement shown. mayV betaken as. typical of any suit# able-structure and-since'the`- specific arrange# ment Vforms no part .of the present.-inv`ention,

further description isunnecessary. Carrieds-uitable part; andl preferably formed int'egral' therewith, is '-q tubular support; 2, upon the1. V upper end o'ff which is formed or. sup- -portedfra cylinder 3.. This cylinder has' 'a with a projecting.

head orcover L formed guide-member 5; lnside the.. cylinder 3. is ai piston 6 having a stem 7 whichfproyects' bothfabove. and belowiit and has a fluid tight tubular supportV 2 vrand Sliding t withfthe withsthe guide member-5, The lower'. end

directly connected. -the'stem 7 in aline der, on efof which is connected'to'thevalve; vinoves relative tothe "other, the "fr `ibdiiuission of. fluid to the cylinder 'on oppothe` stem 7. This formsa it may he .for

. forlthe admission of may .be .disch ofgthe'fstemis connected to the vajlv'e mecha- .In `the present instance itis shown ment with-thevalve'stem. .Thes'temflis 8 is a valve stem carrying thespaced val-ve bodies 9 and 10 which lar portion' ofthe stem 7 and control the I ports 11 land 12. These ports connect the sides of thepiston 6. 7.'.Thev a1 ve ste1n8 is provided with an axial .bore 13 extending to .a point between the valve bodies 9' and 10, and-with an or openings 14 which connect the slide .With the tubucylinder on opposite with the bore of stem om .its lower.. end

opening bore 13 with the space between said valve openings '15l which connect the interior 8 is enlarged as at-8"to mnke a Huid tight chamber 17. be-

tween the upper edge of thefenl-arged portion 1 6 Jand the valve body., 10.1. The guide'.

member 5 is cored out to form avchamber 18 sliding fit :with

bodies. 1` Just below'tlie lower end of stem 8,;the pis v ton stem 7- is provided-with an opening 01' therev of with a chamber 1 6 formed-.in the support 2, The lower end of thev stem and above this chamber the .stem..8 has a.

guide member, asshown at 19t.` Thechamnular .space or chamber 20 beims'e-enthe Ste f valve body 9,- and this 7 land* 8 abovejhe space or chamber20 is. connected with the chamber 17' byni'eans of thej passage 21.

.22 isa '24 is av :drain pipe connecting space 2 5 a,t the upper end of the guide member 5i to 'the discharge pipe 2 3. The upper end of stem 8 1s connected toga;

which in 911111115 Gemme@ `governor lever26,

understood that a governor responsive to pipeconnect'edwith the'ch-amber 1 8.

' operatingfluid tothe- I nechanism.and 23 isa-pipe connected with chamber 16 4and through which the ."operat-r ing-fluid is discharged.. vThe operating arged; from pipe- 23 at latmos.Y

pheric pressure or other suitablepressure, bythe cover of the valve .structureor other' any other operating conditionr'of thefma'- chine on which .the valve-gear is as for example a governor I esponeive to pressure, orsuction',v may be'used The 'operation is astollows In-.thedrawj Y 21, annular space ing the valve bodies 9 and 10 are shown as covering ports 11 and 12 and the parts are at rest. The flow of operating fluid is completely cut off. 1f now the governor oper.- ates to raise the stem 8 so as to uncover ports 11 and 12, the space below the piston 6 will be connected with the source of fluid pressure through port 12, chamber 17, passage 20 and pipe 22. At the above the piston 'will discharge pipe 23 by way of port 11, the space between the valve bodies 9, 10, openings 14, bore 13, openings 15 and chamber 16. The Huid entering under the piston 6 will raise it, the Huid above the piston being The movement of the piston acts to operate the valve mechanism 1, opening it inthe arrangement shown. As the piston moves, the ports 11 and 12 are moved with it, and after moving ay predetermined amount, depending upon ernor has moved the stem '8, they will again be covered bv the valve bodies 9 and 10. The parts will then come to rest. Should same time, the space be connected to the v the governor Aoperate in the opposite sense 'valve' of the hydraulic y carries the parts having the ports 11 and 12,

which parts constitute the sleeve of the pilot to'lower the stem 8, the operation would be the same, except in a reverse direction, the space above the piston being connected to pipe-22, and that below the piston to pipe 23. It will be noted that while a movement of the governor is necessary to uncover the ports 10 and 11 to'cause the mechanism to operate, litneed not move to close them as the movement of the piston 6 which operates the valve mechanism` 1 performs this unc-Y tion. In other words, the

arrangement embodies the principle of the well known follow-up device commonv withY regulating mechanisms of this general type, the purpose of which is to prevent over regulation or hunting. It avoids, however, the use of thenumerous lever and link ,connections heretofore required, accomplishing the same result in a much simpler manner.

. When oil is' used as the operatingv fluid it will also serve to lubricate the various sliding parts, which parts are provided with circumferential grooves,

fluid escaping from chamber 18 up into chamber 25 is drained od through pipe 2li to the discharge pipe 23.

Viewed in one aspect the valve bodies 9, 10 and the coperating parts having the ports 11, 12 constitute in substance the pilot motor. The piston valve. The piston and cylinder are preferably concentric with the pilot valve.

lVhile in the present instance the stem of' the motor is lshown as being in line with the `valve stem and directly connected thereto,

forced out through pipe 23.-

with openings through below the piston, a second vstein;projectn the amount which the govas shown, in orderA to render them more nearly fluid tight. Any

.it will be understood tnatthe invention ls ciple of operation of my invention, together with the apparatus which 1 now consider torepresent the best embodiment thereof; but I desire to have itvunderstoodthat the apparatus shown is only illustrative, and that the invention can be carried cnt by other means. Y

l Whatl claim as new1 and desire-t0 secure by Letters Patent of the United States, Iisf-'- 1. In a fluid motor, the combination of a cylinder, a piston, a hollow stem projectin on opposite sides of the piston and provid its wall abovegnd into the hollow stein and havingf spa" valve bodies thereon which normally covers'aid openingsfsaid second stem having a bore' which connects with the space between said valve bodies, passages connecting, the spaces on the outer sides of said valve bodies to each other, and admission and discharge pipes connected to said passages and bore. 2. In a fluid motor, the combination of a cylinder, a piston, a hollow ,stem projecting on oppositesides of the piston and having openings through its wall which communicate with the cylinder on opposite sides of the piston, a second stem projecting into the hollow stem and having spacedvalve bodies thereon which normally coverl saidopenings, and an a'Xial bore connected with the'space between the valve bodies, portions of said second steinA above and below the valve bodies being of lesser diameter than the bore of said hollowstem so asto orm'annular chambers between them, means forming a passage which connects said annular chambers to each other, and iluid pressure conduits communicating lwith'the chambers and the axial borein the second stem. i

3.'1n a valve gear, the combination with a valve comprising a casing and a ,valve body, of a fluid motor mounted directly on said casing with its stem in line with and directly'connected to said valve body, `said lluid. motor comprisinga cylinder, a `piston which carries the stem, said stem projecting lar chambers between the valve bodies and on opposite sides thereof, means forming a.-v passage which connects thespaceson 011-' 'Lx 4322 i posite sides of the valve bodies to eachl my hand this twenty'fourth day of Decem-A other, 'a b'oeinhtha pilotbvalve st ellwhch ber, 1914.2 connects Wit t ef space etween t e va ve' bodies, and. fiud pressure conduits which k RICHARD H' RICE' 5 communicate with the spaces .on opposite Witnesses:

sides ofthe valve bodies'zmdywth said bote. JOHN J. MCKENNEY,

En witness Wheref, A-fhave hereunto set JOHN A. MCMANUsY, Jr.- 

